X11: Alert only when video drivers fail initialization

Before, they would always complain even if there was no attempt at
initializing them (e.g. because there's no X11 display).

While we're at it, this patch also adds a specific message for OpenGL ES
and rewords "OpenGLES" to "OpenGL ES" in an error, for consistency
(AFAIK we either say "GLES" or "OpenGL ES").

platform/linuxbsd/x11/display_server_x11.cpp

@@ -5428,25 +5428,6 @@ Vector<String> DisplayServerX11::get_rendering_drivers_func() {
 
 DisplayServer *DisplayServerX11::create_func(const String &p_rendering_driver, WindowMode p_mode, VSyncMode p_vsync_mode, uint32_t p_flags, const Vector2i *p_position, const Vector2i &p_resolution, int p_screen, Context p_context, Error &r_error) {
 	DisplayServer *ds = memnew(DisplayServerX11(p_rendering_driver, p_mode, p_vsync_mode, p_flags, p_position, p_resolution, p_screen, p_context, r_error));
-	if (r_error != OK) {
-		if (p_rendering_driver == "vulkan") {
-			String executable_name = OS::get_singleton()->get_executable_path().get_file();
-			OS::get_singleton()->alert(
-					vformat("Your video card drivers seem not to support the required Vulkan version.\n\n"
-							"If possible, consider updating your video card drivers or using the OpenGL 3 driver.\n\n"
-							"You can enable the OpenGL 3 driver by starting the engine from the\n"
-							"command line with the command:\n\n    \"%s\" --rendering-driver opengl3\n\n"
-							"If you recently updated your video card drivers, try rebooting.",
-							executable_name),
-					"Unable to initialize Vulkan video driver");
-		} else {
-			OS::get_singleton()->alert(
-					"Your video card drivers seem not to support the required OpenGL 3.3 version.\n\n"
-					"If possible, consider updating your video card drivers.\n\n"
-					"If you recently updated your video card drivers, try rebooting.",
-					"Unable to initialize OpenGL video driver");
-		}
-	}
 	return ds;
 }
 
@@ -6160,25 +6141,40 @@ DisplayServerX11::DisplayServerX11(const String &p_rendering_driver, WindowMode
 	rendering_driver = p_rendering_driver;
 
 	bool driver_found = false;
+	String executable_name = OS::get_singleton()->get_executable_path().get_file();
+
+	// Initialize context and rendering device.
+
 #if defined(RD_ENABLED)
 #if defined(VULKAN_ENABLED)
 	if (rendering_driver == "vulkan") {
 		rendering_context = memnew(RenderingContextDriverVulkanX11);
 	}
-#endif
+#endif // VULKAN_ENABLED
 
 	if (rendering_context) {
 		if (rendering_context->initialize() != OK) {
-			ERR_PRINT(vformat("Could not initialize %s", rendering_driver));
 			memdelete(rendering_context);
 			rendering_context = nullptr;
 			r_error = ERR_CANT_CREATE;
-			return;
+
+			if (p_rendering_driver == "vulkan") {
+				OS::get_singleton()->alert(
+						vformat("Your video card drivers seem not to support the required Vulkan version.\n\n"
+								"If possible, consider updating your video card drivers or using the OpenGL 3 driver.\n\n"
+								"You can enable the OpenGL 3 driver by starting the engine from the\n"
+								"command line with the command:\n\n    \"%s\" --rendering-driver opengl3\n\n"
+								"If you recently updated your video card drivers, try rebooting.",
+								executable_name),
+						"Unable to initialize Vulkan video driver");
+			}
+
+			ERR_FAIL_MSG(vformat("Could not initialize %s", rendering_driver));
 		}
 		driver_found = true;
 	}
-#endif
+#endif // RD_ENABLED
-	// Initialize context and rendering device.
+
 #if defined(GLES3_ENABLED)
 	if (rendering_driver == "opengl3" || rendering_driver == "opengl3_es") {
 		if (getenv("DRI_PRIME") == nullptr) {
@@ -6233,6 +6229,16 @@ DisplayServerX11::DisplayServerX11(const String &p_rendering_driver, WindowMode
 				rendering_driver = "opengl3_es";
 			} else {
 				r_error = ERR_UNAVAILABLE;
+
+				OS::get_singleton()->alert(
+						vformat("Your video card drivers seem not to support the required OpenGL 3.3 version.\n\n"
+								"If possible, consider updating your video card drivers or using the Vulkan driver.\n\n"
+								"You can enable the Vulkan driver by starting the engine from the\n"
+								"command line with the command:\n\n    \"%s\" --rendering-driver vulkan\n\n"
+								"If you recently updated your video card drivers, try rebooting.",
+								executable_name),
+						"Unable to initialize OpenGL video driver");
+
 				ERR_FAIL_MSG("Could not initialize OpenGL.");
 			}
 		} else {
@@ -6243,20 +6249,28 @@ DisplayServerX11::DisplayServerX11(const String &p_rendering_driver, WindowMode
 
 	if (rendering_driver == "opengl3_es") {
 		gl_manager_egl = memnew(GLManagerEGL_X11);
-		if (gl_manager_egl->initialize() != OK) {
+		if (gl_manager_egl->initialize() != OK || gl_manager_egl->open_display(x11_display) != OK) {
 			memdelete(gl_manager_egl);
 			gl_manager_egl = nullptr;
 			r_error = ERR_UNAVAILABLE;
-			ERR_FAIL_MSG("Could not initialize OpenGLES.");
+
+			OS::get_singleton()->alert(
+					"Your video card drivers seem not to support the required OpenGL ES 3.0 version.\n\n"
+					"If possible, consider updating your video card drivers.\n\n"
+					"If you recently updated your video card drivers, try rebooting.",
+					"Unable to initialize OpenGL ES video driver");
+
+			ERR_FAIL_MSG("Could not initialize OpenGL ES.");
 		}
 		driver_found = true;
 		RasterizerGLES3::make_current(false);
 	}
 
-#endif
+#endif // GLES3_ENABLED
+
 	if (!driver_found) {
 		r_error = ERR_UNAVAILABLE;
-		ERR_FAIL_MSG("Video driver not found");
+		ERR_FAIL_MSG("Video driver not found.");
 	}
 
 	Point2i window_position;
@@ -6297,7 +6311,7 @@ DisplayServerX11::DisplayServerX11(const String &p_rendering_driver, WindowMode
 
 		RendererCompositorRD::make_current();
 	}
-#endif
+#endif // RD_ENABLED
 
 	{
 		//set all event master mask
@@ -6450,7 +6464,8 @@ DisplayServerX11::DisplayServerX11(const String &p_rendering_driver, WindowMode
 	screen_set_keep_on(GLOBAL_GET("display/window/energy_saving/keep_screen_on"));
 
 	portal_desktop = memnew(FreeDesktopPortalDesktop);
-#endif
+#endif // DBUS_ENABLED
+
 	XSetErrorHandler(&default_window_error_handler);
 
 	r_error = OK;